
public class USPhoneNumber extends PhoneNumber
{
	private static final String COUNTRY_CODE ="01";
	public static final int NUMBER_LENGTH = 10;
	
	public String getCountryCode()
	{
		return COUNTRY_CODE;
	}
	
	public void setPhoneNumber ( String newNumber)
	{
		if ( newNumber.length() == NUMBER_LENGTH)
		{
			super.setPhoneNumber(newNumber);
		}
	}
}
